CN103056302A - Ceramic core for molding aeroengine case type annular casting hollow support plate - Google Patents
Ceramic core for molding aeroengine case type annular casting hollow support plate Download PDFInfo
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- CN103056302A CN103056302A CN2013100448973A CN201310044897A CN103056302A CN 103056302 A CN103056302 A CN 103056302A CN 2013100448973 A CN2013100448973 A CN 2013100448973A CN 201310044897 A CN201310044897 A CN 201310044897A CN 103056302 A CN103056302 A CN 103056302A
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- powder
- ceramic core
- support plate
- granularity
- corundum powder
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- 239000000843 powder Substances 0.000 claims abstract description 49
- 239000000919 ceramic Substances 0.000 claims abstract description 41
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 6
- 239000011162 core material Substances 0.000 claims description 46
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000084 colloidal system Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 239000000835 fiber Substances 0.000 abstract description 11
- 229910052593 corundum Inorganic materials 0.000 abstract 5
- 239000010431 corundum Substances 0.000 abstract 5
- 239000004952 Polyamide Substances 0.000 abstract 3
- 229920002647 polyamide Polymers 0.000 abstract 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract 3
- 238000013019 agitation Methods 0.000 abstract 1
- 238000007580 dry-mixing Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920006306 polyurethane fiber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to a method for fabricating a ceramic core for molding a support plate. The method comprises the following steps of: weighing 3 kg of fused corundum powder having the granularity ranging from 20 to 40 meshes, 3 kg of fused corundum powder having the granularity ranging from 50 to 100 meshes, 3 kg of fused corundum powder having the granularity ranging from 200 to 325 meshes, 0.5 kg of polyamide fibers and 0.12 kg of ammonium chloride, and putting all the materials in a V-shaped mixer for dry mixing for 24 hours under the condition that the rotating speed is 120 r/min, thereby obtaining ceramic core raw material powder for future use, wherein the fused corundum powder is different in granularity, the alumina content of the fused corundum powder is greater than or equal to 99wt%; the polyamide fibers are 0.1-3 mm long and the diameter of the polyamide fibers is 20-200 microns; weighing 400 g of silica sol and putting the weighed silica sol in a 1000 ml beaker, and then weighing 600 g of the raw material powder, adding the raw material powder to the beaker, and mixing the raw material powder with the silica sol for 1 minute under the condition of intense agitation, thereby obtaining slurry; and pouring the slurring in the inner cavity of a casting wax pattern support plate, and curing the slurry in 5 minutes, thereby obtaining the solid ceramic core having certain strength.
Description
The application divides an application, the application number of original application: 201110413926X, the applying date: 2011-12-13, invention and created name: ceramic core for molding of support plate and preparation method thereof.
Technical field
The present invention relates to a kind of model casting technology of the heavy castings with hollow support plate, particularly a kind of for the moulding of aero-engine casing class annular cast hollow support plate with alumina based ceramic core material and preparation method.
Background technology
Increasing the front intake air temperature of aero-turbine and loss of weight is the main path that improves its thrust-weight ratio.Consist of the main load parts of aero-engine, also increasingly sophisticated such as the structural design of the parts such as high temperature alloy rear housing, titanium alloy intermediary casing, therefore harsher requirement has been proposed for its metal matrix material and process technology thereof.Course and future trend from the development of World Airways developed country, in the certain situation of motor power, design and adopt whole smart casting technology by casing class foundry goods thin-walled property, make the loss of weight of engine own and improve reliability, greatly having promoted engine performance, also is one of effective way that improves thrust-weight ratio.
Nearly clean shape melted module precise casting technology is to prepare the most important technology of engine crankcase class formation spare both at home and abroad.Then this technology makes ceramic shell by adopting the wax material compacting wax-pattern of fusible mistake, after the dewaxing ceramic shell is carried out roasting, at last with the casting of metals of melting in shell, clear shell namely obtains required foundry goods after metal freezing, cooling.By to mold material and to the strict control of each process procedure and technological factor in the foundry goods forming process, can obtain the near clean shape foundry goods that working face need not machining or only carries out detail sanding.Therefore melted module precise casting technology has large thin-wall element and the unitarily formed advantage that the casting dimensional accuracy is high, surface roughness is low, can be used for casting complex-shaped (particularly inner chamber is complicated).
The aero-engine casing base part has some hollow support plates usually, in order to obtain its hollow-core construction, must increase ceramic core in the oblique support plate position in ceramic shell, until casting pouring, solidify, cool off after, at first remove shell, then ceramic core is removed with machinery or chemical method from support plate, namely obtained the casing foundry goods that support plate has hollow-core construction.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of ceramic core for molding of support plate and preparation method thereof, with the demand of the melted module precise casting technology that satisfies aero-engine casing class foundry goods.
For solving the problems of the technologies described above, the invention provides a kind of ceramic core for molding of support plate, it comprises: varigrained electro-corundum powder, organic fiber, ammonium chloride and Ludox; Described varigrained electro-corundum powder, its alumina content 〉=99wt%, granularity is respectively 20-40 order, 50-100 order and 200-325 order; Wherein, granularity is that the mass percent of 20-40 purpose electro-corundum powder is 10%-30%, and granularity is that the mass percent of 50-100 purpose electro-corundum powder is 20%-40%, and granularity is that the mass percent of 200-325 purpose electro-corundum powder is 30%-70%; Described organic fiber is one of nylon fiber, polyurethane fiber, Fypro, length 0.1-3mm, and diameter 20-200 μ m, addition is the 1-20% of described electro-corundum opaque amount; Described ammonium chloride, pure for analyzing, size distribution is between the 200-325 order, and the addition of ammonium chloride is the 0.08-0.12% of electro-corundum powder; Described Ludox, pH value are 8-10, wherein content 〉=the 28wt% of silicon dioxide colloid particle; The quality of this Ludox is the 60-70% of the quality summation of described electro-corundum powder, organic fiber and ammonium chloride.
The preparation method of above-mentioned ceramic core for molding of support plate comprises:
The first step, the preparation powder material: above-mentioned varigrained electro-corundum powder, organic fiber and ammonium chloride powder are joined in the V-type batch mixer, force to be dry mixed, the rotating speed of V-type batch mixer is 120 to turn/min, incorporation time is 12-24h, namely obtains the ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in the Ludox, with machine,massing mixing 50-70s, namely obtain ceramic core moulding by casting slurry;
The 3rd step, moulding by casting: described slurry is poured in the support plate cavity of foundry goods moltening mold castings wax-pattern, solidifies through the 8-12min disposed slurry, obtain the solid core.This core can be removed behind casting pouring, makes the support plate of foundry goods have the hollow-core construction of certain size and shape.
Below the present invention is further illustrated:
The electro-corundum powder that adopts among the present invention is the material of main part that consists of ceramic core, because thermal coefficient of expansion is very low, so substantially do not have change in size in roasting and casting pouring process, is conducive to the control of support plate cavity size precision.
Organic fiber of the present invention, its effect are to provide certain humidification to the wet base substrate of ceramic core, and the moisture evaporation causes the generation of cracking phenomena when avoiding simultaneously core because of roasting; Simultaneously, organic fiber because of the oxidation burn off, makes ceramic core produce certain hole after roasting in the Baking process, is beneficial to the removing of core.
Ammonium chloride of the present invention is the curing agent of Ludox, and its effect is to make Ludox that gelation namely occur at normal temperatures, and the ceramic powder raw material is bonded together, and becomes the ceramic core with some strength.By adjusting the ratio of ammonium chloride and Ludox, can accurately control the time that ceramic core solidifies.
Ludox of the present invention, its effect are the binding agents as ceramic powder, through reacting and gelation with ammonium chloride, give the certain normal temperature strength of ceramic core and elevated temperature strength.
The present invention has the following advantages:
(1) to prepare the used ceramic material main component of alumina-based ceramic core be varigrained electro-corundum powder in the present invention, and electro-corundum is chemical grade α-Al
2O
3Make through fixed electric furnace or Dumpage type electric furnace smelting process, density is high, and sintering activity is low, and thermal coefficient of expansion is very little.After forming ceramic core, size is lower because of thermal coefficient of expansion in roasting and metal bath casting process, so change in size is very little, and is not yielding, is conducive to keep the dimensional accuracy of support plate cavity;
(2) alumina based ceramic core material of the present invention, can adjust its hardening time by the addition of adjusting curing agent ammonium chloride, namely shortens along with the increase of curing agent addition the hardening time of ceramic core.The controllability of ceramic core hardening time has guaranteed that the operator can reserve the sufficient time and finish the process of core cast;
(3) organic fiber of the present invention can provide significant humidification to the wet base substrate of ceramic core, and can avoid the cracking of core in roasting process; Organic fiber can also make ceramic core have certain hole because of the high-temperature oxydation burn off simultaneously, is beneficial to core and removes from the foundry goods support plate after cast.
The specific embodiment
The below elaborates to embodiments of the invention: present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment and concrete operating process.
Embodiment 1:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 1kg, granularity is 50-100 purpose electro-corundum powder 20g, granularity is 200-325 purpose electro-corundum powder 7kg, nylon fiber 0.1kg, ammonium chloride 0.08kg puts in the V-type batch mixer, at rotating speed is 120 to turn/be dry mixed 12h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of casting wax mould support plate, behind about 10min, slurry curing namely obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was more easily removed from the support plate cavity.
Embodiment 2:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 2kg, granularity is 50-100 purpose electro-corundum powder 3kg, granularity is 200-325 purpose electro-corundum powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg puts into and puts into the V-type batch mixer, at rotating speed is 120 to turn/be dry mixed 18h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of casting wax mould support plate, behind about 8min, slurry curing namely obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was easily removed from the support plate cavity.
Embodiment 3:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 3kg, granularity is 50-100 purpose electro-corundum powder 3kg, granularity is 200-325 purpose electro-corundum powder 3kg, Fypro 0.5kg, ammonium chloride 0.12kg puts into and puts into the V-type batch mixer, at rotating speed is 120 to turn/be dry mixed 24h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of casting wax mould support plate, behind about 5min, slurry curing namely obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was defeated and dispersed voluntarily, was easy to remove.
Claims (1)
1. the preparation method of a ceramic core for molding of support plate, it is characterized in that comprising: taking by weighing granularity is 20-40 order, described varigrained electro-corundum powder, the electro-corundum powder 3kg of its alumina content 〉=99wt%, granularity is 50-100 purpose electro-corundum powder 3kg, granularity is 200-325 purpose electro-corundum powder 3kg, Fypro 0.5kg, ammonium chloride 0.12kg, put into and put into the V-type batch mixer, at rotating speed be 120 turn/be dry mixed 24h under the condition of min, obtain the ceramic core material powder, for subsequent use; Wherein, described varigrained electro-corundum powder, its alumina content 〉=99wt%; The length 0.1-3mm of described Fypro, diameter 20-200 μ m;
Take by weighing Ludox 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain slurry; Wherein, described Ludox, the pH value is 8-10, wherein content 〉=the 28wt% of silicon dioxide colloid particle;
Slurry is poured in the cavity of casting wax mould support plate, behind the 5min, slurry curing namely obtains having the solid ceramic core of some strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100448973A CN103056302A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding aeroengine case type annular casting hollow support plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100448973A CN103056302A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding aeroengine case type annular casting hollow support plate |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 201110413926 Division CN102489670B (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding of support plate and preparation method thereof |
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| CN103056302A true CN103056302A (en) | 2013-04-24 |
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| CN2013100448973A Pending CN103056302A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding aeroengine case type annular casting hollow support plate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386703A (en) * | 2013-07-24 | 2013-11-13 | 中国南方航空工业(集团)有限公司 | Forming method for ceramic die core |
| CN105149518A (en) * | 2015-10-14 | 2015-12-16 | 河北天宇高科冶金铸造有限公司 | Sand core and method for casting molding of deep holes with same |
| CN105964936A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Wood pulp fiber-enhanced water-soluble mold core and preparation method thereof |
| CN105964893A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Bagasse pulp-containing water-soluble mold core and preparation method thereof |
| WO2017151107A1 (en) * | 2016-03-01 | 2017-09-08 | M. Argueso & Co., Inc. | Fiber-reinforced casting wax product |
| CN113999025A (en) * | 2021-10-29 | 2022-02-01 | 深圳艾利佳材料科技有限公司 | Manufacturing method of low-cost titanium alloy composite ceramic sintering jig |
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| CN102039375A (en) * | 2010-11-20 | 2011-05-04 | 沈阳工业大学 | Method for quickly manufacturing high-temperature alloy hollow blade casting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386703A (en) * | 2013-07-24 | 2013-11-13 | 中国南方航空工业(集团)有限公司 | Forming method for ceramic die core |
| CN105149518A (en) * | 2015-10-14 | 2015-12-16 | 河北天宇高科冶金铸造有限公司 | Sand core and method for casting molding of deep holes with same |
| CN105964936A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Wood pulp fiber-enhanced water-soluble mold core and preparation method thereof |
| CN105964893A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Bagasse pulp-containing water-soluble mold core and preparation method thereof |
| WO2017151107A1 (en) * | 2016-03-01 | 2017-09-08 | M. Argueso & Co., Inc. | Fiber-reinforced casting wax product |
| CN113999025A (en) * | 2021-10-29 | 2022-02-01 | 深圳艾利佳材料科技有限公司 | Manufacturing method of low-cost titanium alloy composite ceramic sintering jig |
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Application publication date: 20130424 |